Insulated hanger for arc-lamps.



No. 766,284. PATENTED AUG. 2, 1904.

' H. J. PFIESTBR.

INSULATED HANGER FOR ARC LAMPS.

I APPLIOATIONVFILED MAB. 7. 1903. N0 MODEL.

\[TNESS s UNITED STATES xauuuuuu. August :4, .L'cdUi.

PATENT OEEIcE.

HENRY J. PFIESTER, OF CINCINNATI, OHIO, ASSIGNOR OF ONE-HALF TO WVILLIAM A. MoCALLUM, OF CINCINNATI, OHIO.

INSULATED HANGER FOR ARC-LAMPS- SPECIFICATION forming part of Letters Patent No. 766,284, dated August 2, 1904. Application filed March '7, 1903. Serial No. 146,624. (No model.)

To aZZ whom it may concern.-

Be it known thatI, HENRY J. PFIESTER, a citi- Zen of the United States, residing atCincinnati, in the county of Hamilton and State of Ohio,

have invented new and useful Improvements in Insulated Hangers for Are-Lamps and other Electrical Fixtures, of which the following is a specification.

My invention relates to insulated hangers for suspending arc-lamps and other electrical fixtures, its object being the production of an inexpensive insulated hanger capable of resisting high voltage of current. Incidentally, also, it is a feature of my invention that eertain parts-to wit, the external casing and the suspending-hookcan be made of proper size and form to receive a standard form of insulator used in quite different situations for a different purpose, but obtainable almost everywhere, so that these parts may be made and sold independently as articles of manufacture to be combined by the user with the standard glass insulator to produce the hanger complete.

To these ends my invention consists principally in a bell-shaped casing in two or more parts adapted to be fitted together, and thereby inclose and support a correspondinglyformed insulator of glass or similar material having a circumferential groove or re- 3 cess which the casing is formedto engage, also in a suspending-hook having an enlarged screw-threaded shank adapted to engage removably in a correspondingly-threaded under socket of the insulator.

It also consists in the combination of the easing and insulator, formed as described, to effect a supporting engagement and in the further combination of these parts with the suspending-hook and also in the preferred form of the 4 hook, all as hereinafter set forth.

My invention is illustrated in the accompanying drawings, in which its general form and adaptation to the standard pole-top insulator in common use are shown, and in which- Figure 1 is a general elevation of the device complete; Fig. 2, an axial section of same; and Fig. 3, a detail of the hook, showing its preferred form.

Referringnow to the drawings, A designates the outer casing, consisting of a bell-shaped 5o shell or casing in two similar parts adapted to be fitted together in an axial plane and secured by bolts or screws 0.

B designates the insulator, which in the case shown is the ordinary standard pole-top glass insulator with internal threaded socket adapted to screw upon the top of a pole or upon stems secured to the cross-arms of a pole to carrytelegraph-wires or the feed-wires of distributing electric currents. Such standard insulators are provided with an external circumferential groove or recess designed to receive the fastening-wires for holding the transmitting-conductors (feed-wires, telegraphwires, &c.) which the insulator is primarily intended to support.

I form the casing A with a corresponding circumferential rib (0 upon the inside of the bell, which enters said groove and constitutes the holding element securing the parts together, While the casing thus forms a support and protector and at the bottom forms an additional flange or petticoat to ward off moisture.

Within the threaded socket of the insulator B, I insert the correspondingly-formed shankcof asuspending-hook C, the said scre\ shank being at the same time a binding element extending nearly through the glass insulator and connecting the portion of the same above with that below the cross-plane of the groove and is also a distributing element for the strains of suspended weight equally through the mass of the glass insulator.

The hook C is a rod of metal, which may 5 be formed integral with the shank c or as an independent rod of metal, carried through a shank of other material, such as fiber, lead, wood, &c. The end constituting the hook proper I prefer to form into a spiral bend, as 9 shown, which facilitates insertion or removal of the lamp or fixture to be suspended or permits entire freedom to swing without danger of accidental detachment and without movable parts liable to freeze together or break. Thus constituted it will be noted, first, that the hanger as a whole is simple and economical of construction, and, second, the insulator B is an integral element of glass or similar vitreous material of the highest possible electrical resistance and that no composition or filling of any kind is required. It will also be noted, third, that the strains of the suspended load are taken directly by the metal casing in such manner as to require absolute breakage of the entire casing at the zone of the rib before the glass insulator will be released, and, fourth, that the hook is carried upon a continuous thread extending through the mass of the insulator into the portion above the plane where the breakage would be otherwise liable to occur, and hence forms a binding element to prevent breakage.

While I have herein shown my invention as adapted to the form and construction of the standard glass insulator described, it will be readily understood that this is not an absolute essential feature of my invention, but a matter of convenience. Casings adapted to the standard form can be produced and sold in connection with the screwshanked hooks, and the insulator being a widely-distributed article of trade can be procured by the purchaser of the casings independently.

An incidental advantage of this construction and combination of parts, due to the general circular form of casing and insulator, is the freedom of the latter to rotate in the casing, so that the suspended fixture may have any radial adjustment desired. The casing I claim as my invention and desire to secure by Letters Patent of the United States 1. As a new article of manufacture, a bellshaped casing inclosing the top and sides of the insulator and divided in an axial plane, and means detachably uniting said parts said casing having a rib extending around its inner circumference and adapted to engage a corresponding groove in the insulator.

2. An insulated hanger for suspending arclamps, &c. embodying in combination a bellshaped casing divided in an axial plane; external means for detachably uniting said parts said casing having around its inner circumference a rib or projection; an insulator within and inclosed on its top and sides by the easing, and having a circumferential groove to receive said rib of the casing; and a suspending-hook having a threaded shank entering the insulator from below and extending part way through the same and engaging a correspondingly-threaded aperture in the insulator.

3. In combination, an insulator of non-conducting material with a central socket enlarged at its lower end, substantially as shown; a thin, stiff and tough shield flaring outwardly and leaving an open space with free circulation of air between the outer surface of the body of the insulator and the inner surface of the shield; and means securing said shield closely to the neck of the insulator.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HENRY J. PFIESTER. W'itnesses:

CHAs. HERBERT JONES, JOSEPH R. GARDNER. 

